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10 Structure, function and maintenance standard
1.
Pressure compensation valve (Arm out)
2.
Pressure compensation valve (R.H. travel
reverse)
3.
Pressure compensation valve (Left swing)
4.
Pressure compensation valve (Boom raise)
5.
Pressure compensation valve (L.H. travel
reverse)
6.
Pressure compensation valve (Bucket dump)
7.
Pressure compensation valve (Boom Hi raise)
8.
Variable pressure compensation valve (Ser-
vice 1)
9.
Variable pressure compensation valve (Ser-
vice 2)
10. Pressure compensation valve (Arm Hi in)
11. Pressure compensation valve (Bucket curl)
12. Pressure compensation valve (L.H. travel for-
ward)
13. Pressure compensation valve (Boom lower)
14. Pressure compensation valve (Right swing)
15. Pressure compensation valve (R.H. travel for-
ward)
16. Pressure compensation valve (Arm in)
17. Main relief valve
18. Unload valve
19. Unload valve
20. Main relief valve
21. Spool (Service 2)
22. Spool (Service 1)
23. Spool (Boom Hi)
24. Spool (Bucket)
25. Spool (L.H. travel)
26. Spool (Boom)
27. Spool (Swing)
28. Spool (R.H. travel)
29. Spool (Arm)
30. Spool (Arm Hi)
No.
Check item
31
Spool return spring
32
Spool return spring
33
Spool return spring
34
Spool return spring
PC300, 350-8
Standard size
Free length x
Installed
Outside diameter
length
54.2 x 34.8
51.2
54.5 x 34.8
51.2
54.6 x 34.8
51.2
54.9 x 24.2
52.0
Criteria
Repair limit
Installed
Free length
load
417 N
—
{42.5 kg}
393 N
—
{40.1 kg}
421 N
—
{42.9 kg}
251 N
—
{25.6 kg}
SEN01994-01
Unit: mm
Remedy
Installed
load
333 N
{34.0 kg}
If damaged or
deformed, replace
315 N
spring.
{32.1 kg}
336 N
{34.3 kg}
201 N
{20.5 kg}
5
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Table of Contents
Troubleshooting
